Weather & Fuels

Here we can see Fire Danger across the zone and forecasted weather. Helpful for RX planning and fire prevention.

HEHO

Very Poor (VI < 2000): Conditions are very unfavorable for smoke dispersion. Low wind speeds or very low mixing heights can trap smoke close to the ground, causing it to accumulate, which can result in poor air quality.
Poor (VI 2000 - 4000): Conditions are still not very favorable for smoke dispersion, and smoke can linger closer to the surface.
Fair (VI 4000 - 8000): This range is moderately favorable for smoke dispersion. While smoke might still impact air quality in localized areas, it is not as severe.
Good (VI 8000 - 12000): Conditions are good for smoke dispersion. Smoke is likely to be lifted and dispersed effectively, reducing impacts on air quality.
Excellent (VI > 12000): Optimal conditions for smoke dispersion. Smoke is quickly dispersed high into the atmosphere and carried away, minimizing air quality impacts.

FIRE DANGER

FIRE DANGER

FIRE DANGER

FIRE DANGER

FIRE DANGER

Explanation of Thresholds:

Extreme (Red): Very high temperatures, strong winds, and low humidity lead to extreme fire danger. Fires are nearly uncontrollable.

(temp > 95°F, windSpeed > 20 MPH, humidity < 15%)

Very High (Orange): Slightly less severe than Extreme but still very dangerous

(temp > 86°F, windSpeed > 15 MPH, humidity < 20%).

High (Yellow): Conditions where fires start easily and spread rapidly, but not quite as severe as Very High or Extreme

(temp > 78°F, windSpeed > 10 MPH, humidity < 30%).

Moderate (Blue): Conditions where fires can start, but spread more slowly and can be controlled

(temp > 65°F, windSpeed > 5 MPH, humidity < 40%).

Low (Green): Low temperature, low wind speed, and high humidity make fire unlikely to start and spread.